Circular Turning Insert Mounting for Stable Indexing
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Solution Overview
Problem
Existing turning tools with circular cutting edges face issues of unstable fixation, leading to potential insert breakage, vibrations, and increased manufacturing costs due to precise dimension requirements for radial ridges and grooves.
Innovation Solution
A turning tool design featuring a turning insert with radial grooves and a first ridge, where the ridge is smaller than the groove, allowing for stable mounting and reduced risk of rotation, breakage, and enabling economical manufacturing by tolerating larger tolerances, thus improving stability and reducing vibrations during machining.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If radial ridges and grooves are used for insert fixation, then the insert can be indexed in multiple positions, but the fixation becomes unstable and the risk of insert breakage increases
Solution Approach 1:
The bottom surface of the insert is segmented into multiple flat surfaces arranged radially, each capable of contacting the support surface. This segmentation allows the insert to be indexed to multiple positions while maintaining stable fixation through flat surface contact rather than relying on precise ridge-groove fitting.
Solution Approach 2:
A shim is introduced as an intermediary element between the insert and the insert seat. The shim compensates for dimensional variations and ensures stable contact between the flat surfaces of the insert and the support surface, reducing the risk of insert breakage while maintaining indexing capability.
2Reliability
If precise dimensions are required for radial ridges and grooves to ensure stable fixation, then the insert can be securely mounted, but manufacturing costs increase
Solution Approach 1:
The design changes the critical parameters from ridge and groove dimensions to flat surface geometry and shim thickness. These parameters are easier to manufacture with standard tolerances, reducing manufacturing costs while maintaining mounting stability through the flat surface contact mechanism.
Solution Approach 2:
The shim is designed as a simple, inexpensive component that can be easily manufactured and replaced if needed. This allows for relaxed tolerances in the insert and insert seat, significantly reducing manufacturing costs while maintaining reliable fixation.
3Strength
If the insert is tightly fixed in the insert seat, then the insert can withstand high cutting forces, but rotation of the insert during machining increases
Solution Approach 1:
The clamping function is extracted from the ridge-groove interface and transferred to dedicated clamping elements (screws or caps) that act on the insert from the top. This allows the bottom flat surfaces to provide stable positioning without bearing the full clamping load, reducing rotation while maintaining cutting force resistance.
Data Source
AI summary
A turning tool includes a tool body, insert seat and a turning insert. The turning insert has a top surface and an opposite bottom surface, a reference plane between the top and bottom surfaces, and a center axis intersecting the top and bottom surfaces. A circular cutting edge of the insert is concentric in relation to the center axis. The bottom surface includes a set of radial grooves and a set of flat surfaces. The flat surfaces extend in a plane parallel to the reference plane. The insert seat includes a bottom surface and a rear surface. The bottom surface of the insert seat has a first ridge and a support surface, wherein at least one of the flat surfaces of the turning insert is in contact with the support surface. A cross-section of the first ridge is smaller than a corresponding cross section of one of the radial grooves.